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Time between Sequential Exposures to Multiple Stress Turns Antagonism into Synergism
Florian Schunck1,2, Matthias Liess1,2
1Department of System-Ecotoxicology, Helmholtz Centre for Environmental Research (UFZ), Permoserstraße 15, 04318 Leipzig, Germany.
Environmental Science & Technology
|September 28, 2022
Summary
The timing and dose of environmental stressors significantly impact aquatic communities. Immediate exposure to low stress doses enhances resistance, while delays can lead to synergistic negative effects.
Area of Science:
- Environmental toxicology
- Aquatic ecology
- Ecotoxicology
Background:
- Aquatic ecosystems face recurrent exposure to diverse toxicants and environmental stressors.
- Understanding the combined effects of multiple stressors is crucial for ecological risk assessment.
Purpose of the Study:
- To investigate the influence of dose, order, and timing of stressor application on aquatic community interactions.
- To determine the combined effects of Esfenvalerate and ultraviolet-B (UV-B) radiation on *Daphnia magna*.
Main Methods:
- A fully-crossed, four-factorial, multiple stress exposure experiment was designed.
- The study examined the effects of Esfenvalerate and UV-B radiation on *Daphnia magna* under varying exposure timings and orders.
- An abstract-mechanistic model was developed to predict stressor interactions.
Main Results:
- Initial exposure to low doses of either UV-B or Esfenvalerate increased resistance to the second stressor when applied immediately.
- A delay of 2 days between stressor applications shifted interactions from antagonism to synergism.
- The developed model accurately predicted observed stressor interactions (model-R2 = 1.0).
Conclusions:
- The duration of the interval between stressor exposures is a critical factor in determining stressor interactions.
- Exposure dose and the temporal dynamics of stress responses significantly influence the combined effects of toxicants and environmental stressors.
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